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Method for determining a rolling condition via frequency analysis of the rotation of the suspension stop

a frequency analysis and suspension stop technology, applied in the direction of cycle equipment, instruments, transportation and packaging, etc., can solve the problems of limitations inherent and prove difficult to decorrelate the various rolling parameters affecting the rotation speed signal of the wheel

Inactive Publication Date: 2007-11-01
SNR ROULEMENTS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038] According to one other embodiment, the additional parameter may concern another assembly including the wheel and the MacPherson strut of the vehicle. In particular, it is possible to make reliable the determination of the pressure of a tyre according to the invention by using the determination of the pressure of at least one of the other tyres, in particular the tyre of the other wheel of the same axle. Indeed, by comparing the two pressures, it is possible to distinguish if the rolling condition affects one tyre or both tyres.

Problems solved by technology

Said determination strategy has the limitations inherent to the need for a specific integration of the sensor and of the detection device, as well as said of a specific mutual communication mode.
However, with such an indirect strategy for determining a rolling condition, it proves difficult to decorrelate the various rolling parameters which affect the rotation speed signal of the wheel.

Method used

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  • Method for determining a rolling condition via frequency analysis of the rotation of the suspension stop
  • Method for determining a rolling condition via frequency analysis of the rotation of the suspension stop

Examples

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first embodiment

[0031] the rolling condition is then determined by comparing the datum measured with a calibration value corresponding to the rolling parameter. In particular, the calibration value may be extracted from an evolution law of the datum according to the rolling parameter, said law being able to be established via experimentation or via simulation.

[0032] In said embodiment, the method allows a rolling condition to be determined in the form of a rolling parameter, for example the pressure of the tyre. Furthermore, the periodic implementation of the method allows the rolling parameter to be continuously monitored and therefore makes it available in real time for, for example, a control computer of the dynamics of the vehicle.

[0033] In an alternative embodiment, the rolling parameter may be recorded periodically, the calibration value being adjusted according to the history of values recorded. Said embodiment allows possible deviations to be taken into account in the time of the evolutio...

second embodiment

[0034] the rolling condition is determined by comparing the variation of a rolling parameter with a threshold corresponding to said condition. In said embodiment, it is, for example, possible to determine a “flat tyre” rolling condition if the pressure in the tyre varies by more than a given percentage in a predetermined time range.

[0035] In particular, when the rolling parameter is recorded periodically, said parameter may be compared with at least one value recorded such as to determine the rolling condition.

[0036] When the method according to the invention is implemented to determine a plurality of rolling conditions, it may be envisaged that some of said conditions correspond to the rolling parameters and that others correspond to rolling parameter evolutions. In particular, for the pressure of the tyre, a joint determination of the value of said, pressure and that of a “flat tyre” condition may be envisaged, said two conditions thus being able to be treated in a differentiate...

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PUM

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Abstract

A method for determining at least one rolling condition of a motor vehicle wheel, which wheel being mounted on the chassis of the vehicle via a MacPherson strut integrating a suspension stop which includes a rotating component in relation to the chassis is described. The method envisages using a device for detecting the angular displacements of the rotating component, which device is suitable for generating an analogue signal which is representative of the angular displacements according to time. The method envisages carrying out a frequency analysis of the analogue displacement signal such as to obtain a spectrum including at least one frequency window wherein at least one datum of the spectrum is based on a rolling parameter; measuring at least one of the data; determining, from the measured datum or data, at least one rolling condition corresponding to the rolling parameter or to the development of the rolling parameter.

Description

BACKGROUND [0001] (1) Field of the Invention [0002] The invention relates to a method for determining at least one rolling condition of a motor vehicle wheel, as well as an assembly including a suspension stop integrated into a MacPherson strut via which a motor vehicle wheel is mounted on the chassis of said vehicle. [0003] (2) Prior Art [0004] In a number of applications, in particular in the control systems of the dynamics of a motor vehicle as for example ABS or ESP, it is necessary to periodically determine some of the rolling conditions of a motor vehicle wheel. In particular, the rolling conditions to be determined may include the air pressure in the tyre of the wheel. [0005] To determine the pressure of the tyre, it is known to use a direct measurement by envisaging, for example, a pressure sensor secured to the wheel and, secured to the chassis, a device for detecting the signal generated by the sensor such as to make available the measurement in the system of coordinates o...

Claims

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Application Information

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IPC IPC(8): B60G17/018G06F17/00
CPCB60C23/061B60C23/062B60G15/068B60G17/0162B60G17/018B60G2200/46B60G2202/12B60G2202/312B60G2204/11B60G2204/112B60G2204/124B60G2204/128B60G2204/418B60G2204/43B60G2204/44B60G2204/4502B60G2204/61B60G2400/206B60G2400/52B60G2400/91B60G2600/188B60G2800/012B60G2800/92B60G2800/94F16C19/163F16C19/527F16C41/008F16C2233/00F16C2326/05G01P3/48
Inventor BLANCHIN, OLIVIER
Owner SNR ROULEMENTS SA
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